Changes to 8.33 kHz channel spacing requirements for certain General Aviation operators
8.33 kHz spacing capable radios have been required on aircraft operating above FL195 and IFR flights in Class A, B or C airspace, for a number of years. The sale of new non-compliant radios by manufacturers has also been prohibited in the EU. The final phase of this regulation now only applies to radios put into service on aircraft subject to the EASA Regulation since 17 November 2013 and aircraft used where 8.33 kHz channel spaced frequencies are in use.
The shortening of the channel spacing allows for an increased number of channels to be allocated. In some European countries there is a shortage of radio frequencies available for use, which has become problematic. This shortage is called Frequency Congestion. Reducing the spacing from 25 kHz to 8.33 kHz will allow for the creation of three channels where before there was only one.
Radios installed before 17 November 2013 and radios fitted in Annex I and Opt-Out aircraft operating in Class G airspace are not obliged to use 8.33 kHz channel spacing radios, nor are ground radio stations where the frequency assigned isn’t an 8.33 kHz spaced frequency. Aircraft operating within or into airspace, or along routes, that have been designated by the competent authority as requiring two-way communication then suitable voice communication must be used. Where the designated frequency is an 8.33 kHz one, then the aircraft radio must be 8.33 kHz channel spacing capable.
The IAA exemption put in place until 31 December 2024 continues to apply to radios fitted after 17 Nov 2013 on aircraft subject to the EASA Regulation. After this, only 8.33 kHz channel spacing capable radios may be used.
Dublin Airport (EIDW) designated frequencies are already 8.33 kHz spaced. Other legislation requires that the designated frequencies are converted to 8.33 kHz spaced frequencies, so it is essential that where two-way communications are required to be established and maintained, the pilot is using radio equipment suitable to the airspace.
Further information is available in IAA Aeronautical Notice O.5.